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[技术互助] A Tip on changing 3 phase AC motor rotation

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发表于 2010-4-14 11:27 | 显示全部楼层 |阅读模式
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本帖最后由 td456 于 2010-4-14 12:28 编辑
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+ r, l6 `( R; P5 A2 j4 {8 PWe all know that if you want to change the rotation of a three  phase AC motor.3 r- Z/ H2 T. l: e/ r" D. f
Just swap any of the two phase leads.
9 S3 @7 L4 R% P: g) a- z9 ?# PBut for VFD application you need to do the swap after the inverter.0 ], G9 e, D! [9 u3 s
If you swap the leads before the inverter, it will not work.
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发表于 2010-4-14 18:18 | 显示全部楼层
go go go
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发表于 2010-4-19 14:38 | 显示全部楼层
Yes, Good point.0 s# V  j6 A/ K; F! i7 A

. [% h' k4 b4 p6 N" vAs the principal of the VFD works, bascially from AC to DC, then DC to AC. + n" Y' X* |8 j% F+ q% o  k: X
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The phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.
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The only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.
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发表于 2010-7-4 00:19 | 显示全部楼层
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